Improvement in plows



IUNTTED STATES PATENT @Trice l i IV. S. COLWELIJ, OF ALLEGIIENY CITY, PENNSYLVANIA.

l IMPROVEMENT iN F'Lows.`

Specification forming part of Letters Patent No. 88,851, dated April 13, 1869.

Be' it known that I, WILLIAM S. COLW ELL, ard of the plow. The curve e' may form an are of the city and county of Allegheny, in the of any size of a circle, so that said curve e may State of Pennsylvania, have invented a new be made to suit the taste of the plow-maker. and useful Improvement in Ilows; and I do I then draw a line, f', from point o3 to point hereby declare that the followingis afull,clear, o5, where line 5 joins D'. This will give the and exact description thereof, reference being desired curve or twistlongitudinally and transhad to the accompanyingdrawings, and to the versely ot' the mold-board-that is to say, the letters of reference marked thereon. desired angle for turning over the furrow. The nature of my invention consists in pro- Having the lines laid out as described, and viding plows with a mold-board, the surface of represented in Figs. 4 and 5, I then cut away which is convexed and curved from its point that portion of the block marked s to the lines i to its heel, and the transverse plane ot' its surh', j", and c. I then mark out the furrowface being straight and conveXed,in the manline f, (see Figs. I and 3,) which must measure ner and for the purpose hereinafter described. about ten inches'from the base-line, (see Fig. To enable others skilled in the art to make 2,) following the vertical and transverse angle and use my invention, I will proceed to deot' the mold-board. I then make averticalline, scribe its construction and operation; i', from point o to a point midway on line D. In the accompanying drawings, which form I then make marks on the furrow-line about part of my specification, Figure lis a side eletwo and one-half inches apart, commencing at 1ation of a plow provided with my improveline i', marking fore and aft on said furrowment in Inoldboards. Fig. 2 is a top view or line. I then draw straightlines between these l plan of the same. Fig. 3 is a transverse secmarks and then draw the lines Z, which arc at tion of the same when cut through at line y of right angles .to said straight lines, and with Fig. 1. Fig. 4, Sheet B, represents a perspecsuitable tools dress off the face of the moldtive view of a block of wood for making the board luntil a straight-edge touching or resting pattern of my improvement in plows, repreon lines h and D', will also touch at all points senting the manner of laying out the lines for on the lines Z on the face of the mold-board, obtaining the desired contour of the moldwhich willgive thede'sired form of mold-board, board and landside. Fig. 5, Sheet B,is aninwith curves, convexities, and angles, hereinverted view, in perspective, of said block of before described.

To all whom it may concern: A the desired curve for the front edge of the standwood. The share-bed in the mold-board is made in To make a medium-sized plow-say about the ordinary manner. The timber between the ten inches wide at the base, and from the point landside and mold-board is cut out, so as to of the mold-board to its heel about thirty-two give the desired thickness of the landside and inches, and from the outer face of the landside mold-board. The contour of the upper edge to the outer line of the top edge of themoldand back end of the mold-board and landside board atits heel about seventeen inches widemay be made to suit the taste of the plow- I take a block of the form represented in Figs. maker. 4 and 5, measuring in length about thirty-two In the drawings, C represents the moldinches, thirteen inches deep, and seventeen board. -@represents the plow-share. I) repreinches wide. Now, taking the surface A of sents the landside,and h the standard t-o which the block for the outer face of thelandside,-I the beam ot the plow is attached; make a gage-mark, C and D', about ten inches he surface of the mold-board from its point from thefaceA. ThelineD will givethewidth A toits heel B is convened, and on the lines of the plow at its base, and the line C will Z the surface is straightthat is to say, by enable me to obtain the desired longitudinal. placing a straight-edge on the lines Z the surconvexity byfplacing a mark at o', and marks face of the mold-board will be found to be parat o2 and o3, and then striking a line which will allelwith the straight-edge. This straight surform the arc of a circle, said line passing over face is clearly shown at line o in Fig. 3;' but the marks o', o2, and o3. 1 then strike a curved if the straight-edge is placed on the lines X` line, e', from point o2 to point 04. This will give i the surface will be found to be convexed. The

mold-board is also curved or twisted from its point A to its heel B, as shown clearly in Fig.

2, and the outer line or edge, i, of' the base of the mold-board is parallel with tl1e"longitudi nal plane of the landside D, as shown in Fig. 3. The mold-board and landside are braced by the cross-piece l. The line f represents'the top line ofthe furrow when resting on or against the mold-board. With exception of the mold-board, in all other respects the plow and its parts are constructed in the usual manner. l By making the mold-board in the manner and form herein described and represented the plow Will be easily controlled by the plowman, and the plow will have a very light draft.

Having thus described the nature, construction, and operation of my improvement, what I claim as of my invention is- Providing a plow with a mold-board the surface of which is from its point A to its heel B convexed, and also conveXed on the lines X and straight on the lines Z, and curved from point A to heel B, as herein described, and for the purpose set forth.

W. S. COLVELL.

Witnesses:

' J AMES J. JOHNSTON,

A. B. GATE. 

